Maxim MAX1486EUB, MAX1486CUB, MAX1485EUB, MAX1485CUB, MAX1481CUB Datasheet

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_______________General Description
The MAX1481/MAX1484/MAX1485/MAX1486 provide software-selectable, half-/full-duplex, low-power, slew­rate-limited, and high-speed (12Mbps) RS-485/RS-422 operation in a 10-pin µMAX package—the smallest 10-pin package available.
The software-selectable, half-/full-duplex MAX1485/ MAX1486 make obsolete the normally larger and more expensive solutions required for selectable half-/full­duplex RS-485/RS-422 operation: 1) a 14-pin, full­duplex transceiver configured via jumpers between receiver and transmitter lines, or 2) two 8-pin, half­duplex transceivers, which require an additional invert­er logic gate for software selectability.
The MAX1481/MAX1484 are functionally equivalent to the industry-standard MAX491 and 75180, and are designed for space-constrained, full-duplex RS-422 applications.
All parts contain one driver and one receiver and fea­ture a 1/8-unit-load receiver input impedance, allowing up to 256 transceivers on the bus. The MAX1481/ MAX1485 feature reduced-slew-rate drivers that mini­mize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 250kbps. The MAX1484/MAX1486 driver slew rates are not limited, allowing them to transmit up to 12Mbps.
The MAX1481/MAX1484/MAX1485/MAX1486 draw only 300µA of supply current. The MAX1481 has a low-power shutdown mode that reduces supply current to only
0.1µA. All devices operate from a single 5V supply. Drivers are output short-circuit current limited and are
protected against excessive power dissipation by thermal-shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail­safe feature that guarantees a logic-high output if the input is open circuit.
____________________________Features
10-Pin µMAX Package: Smallest 10-Pin PackageSoftware-Selectable Half-/Full-Duplex Operation
(MAX1485/MAX1486)
0.1µA Low-Current Shutdown Mode (MAX1481)Slew-Rate Limiting Allows Error-Free Data
Transmission (MAX1481/MAX1485)
12Mbps High-Speed Operation
(MAX1484/MAX1486)
Allow up to 256 Transceivers on the Bus
________________________Applications
Low-Power RS-422/RS-485 Communications Level Translators Hand-Held Equipment Battery-Powered Equipment Transceiver for EMI-Sensitive Applications Industrial-Control Local Area Networks
MAX1481/MAX1484/MAX1485/MAX1486
Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
12Mbps, RS-485/RS-422 Transceivers in µMAX Package
________________________________________________________________
Maxim Integrated Products
1
19-1312; Rev 0; 10/97
PART
MAX1481CUB
MAX1481EUB MAX1484CUB
0°C to +70°C
-40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
10 µMAX 10 µMAX 10 µMAX
______________Ordering Information
______________________________________________________________Selection Table
Half/Full
Duplex
Data Rate
(Mbps)
MAX1481 Full 0.250 MAX1484 Full 12
Part
MAX1485 Selectable 0.250 MAX1486 Selectable 12
Slew-
Rate
Limited
Yes
No
Yes
No
Low-
Power
Shutdown
Driver
Enable
Yes Yes
No Yes No Yes No Yes
Quiescent
Current
(µA)
300 300 300 300
Transceivers
on Bus
256 256 256 256
Pin-
Package
10 µMAX 10 µMAX 10 µMAX 10 µMAX
MAX1484EUB -40°C to +85°C 10 µMAX
Receiver
Enable
Yes Yes
No No
MAX1485CUB MAX1485EUB MAX1486CUB
0°C to +70°C
-40°C to +85°C
0°C to +70°C 10 µMAX
10 µMAX 10 µMAX
MAX1486EUB -40°C to +85°C 10 µMAX
MAX1481/MAX1484/MAX1485/MAX1486
Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited, 12Mbps, RS-485/RS-422 Transceivers in µMAX Package
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +5V ±5%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (VCC) ............................................................+7V Control Input Voltage (
RE, DE, H/F)...........-0.3V to (VCC+ 0.3V)
Driver Input Voltage (DI).............................-0.3V to (V
CC
+ 0.3V)
Driver Output Voltage (A, B, Y, Z)..........................-8V to +12.5V
Receiver Input Voltage, Half Duplex (Y, Z) ............-8V to +12.5V
Receiver Input Voltage, Full Duplex (A, B).............-8V to +12.5V
Receiver Output Voltage (RO)....................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation
10-Pin µMAX (derate 5.6mW/°C above +70°C)............444mW
Operating Temperature Ranges
MAX148_C_ _ ......................................................0°C to +70°C
MAX148_E_ _....................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
R = 50(RS-422), Figure 5
No load, Figure 5
-7V V
OUT
12V
DE = GND
DE, DI, RE, H/F
DE, DI, RE, H/F
R = 50or 27, Figure 5
R = 50or 27, Figure 5
R = 50or 27, Figure 5
DE = GND, VCC= GND or 5.25V
DE, DI, RE, H/F
CONDITIONS
mA35 250I
OSD
Driver Output Short-Circuit Current (Note 3)
µA
-10
I
O
10
Output Leakage (Y and Z) (MAX1481/MAX1484 Only)
mA
0.125
I
IN2
Input Current (Y and Z for Half Duplex, A and B for Full Duplex)
µA±2I
IN1
Input Current
2.0
V
OD1
Differential Driver Output
5
V0.8V
IL1
Input Low Voltage
V2.0V
IH1
Input High Voltage
V0.2∆V
OC
Change in Magnitude of Common-Mode Voltage (Note 2)
V0.2∆V
OD
Change in Magnitude of Differential Output Voltage (Note 2)
V3V
OC
Driver Common-Mode Output Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
DE = GND
-100
I
O
µA
125
Output Leakage (Y and Z) (MAX1485/MAX1486 Only)
V
OD2
R = 27(RS-485), Figure 5
V
1.5 5
VIN= 12V VIN= -7V VIN= 12V VIN= -7V VIN= 12V VIN= -7V
-0.1
DRIVER
Driver Input to Output
MAX1481/MAX1484/MAX1485/MAX1486
Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
12Mbps, RS-485/RS-422 Transceivers in µMAX Package
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +5V ±5%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= +5V and TA= +25ºC.) (Note 1)
SWITCHING CHARACTERISTICS (MAX1484/MAX1486)
(VCC= 5V ±5%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.)
-7V VCM≤ 12V
-7V VCM≤ 12V
IO= 4mA, VID= -200mV
IO= -4mA, VID= 200mV
0.4V VO≤ 2.4V
CONDITIONS
k96R
IN
Receiver Input Resistance
µA±1I
OZR
Three-State Output Current at Receiver
mV70∆V
TH
Receiver Input Hysteresis
mV-200 200V
TH
Receiver Differential Threshold Voltage
V0.4V
OL
Receiver Output Low Voltage
V3.5V
OH
Receiver Output High Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
0V VRO≤ V
CC
RE = GND, DE = V
CC
mA±95I
OSR
Receiver Output Short-Circuit Current
µA300 600I
CC
No-Load Supply Current
DE = GND, RE = V
CC
µA0.1 10I
SHDN
Supply Current in Shutdown Mode (MAX1481 Only)
R
DIFF
= 54, CL1= CL2= 100pF,
Figures 7 and 9
R
DIFF
= 54, CL1= CL2= 100pF,
Figures 7 and 9
CONDITIONS
ns5 10t
DSKEW
Driver Output Skew
| t
DPLH
- t
DPHL
|
30 60t
DPLH
ns
30 60t
DPHL
Driver Input to Output
UNITSMIN TYP MAXSYMBOLPARAMETER
CL= 15pF, S1 closed, Figures 8 and 10
CL= 100pF, S2 closed, Figures 8 and 10
CL= 100pF, S1 closed, Figures 8 and 10
ns40 70t
DLZ
Driver Disable Time from Low
ns40 70t
DZH
Driver Enable to Output High
ns40 70t
DZL
Driver Enable to Output Low
Mbps12f
MAX
Maximum Data Rate
CL= 15pF, S2 closed, Figures 8 and 10
CL= 100pF, S2 closed, Figures 6 and 12
CL= 100pF, S1 closed, Figures 6 and 12
ns20 50t
RZH
Receiver Enable to Output High
ns20 50t
RZL
Receiver Enable to Output Low
ns40 70t
DHZ
Driver Disable Time from High
CL= 100pF, S2 closed, Figures 6 and 12
CL= 100pF, S1 closed, Figures 6 and 12
ns20 50t
RHZ
Receiver Disable Time from High
ns20 50t
RLZ
Receiver Disable Time from Low
Figures 11 and 13 ns5t
RSKD
| t
RPLH
- t
RPHL
| Differential
Receiver Skew
Figures 11 and 13 ns90 150
t
RPLH
,
t
RPHL
Receiver Input to Output
R
DIFF
= 54, CL1= CL2= 100pF,
Figures 7 and 9
ns5 15 35tDR, t
DF
Driver Rise or Fall Time
RECEIVER
SUPPLY CURRENT
MAX1481/MAX1484/MAX1485/MAX1486
Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited, 12Mbps, RS-485/RS-422 Transceivers in µMAX Package
4 _______________________________________________________________________________________
SWITCHING CHARACTERISTICS (MAX1481/MAX1485) (continued)
(VCC= 5V ±5%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.)
Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device
ground unless otherwise noted.
Note 2: ∆V
OD
and VOCare the changes in VODand VOC, respectively, when the DI input changes state.
Note 3: Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during
current limiting.
Note 4: Shutdown is enabled by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the MAX1481
is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 600ns, the MAX1481 is guaranteed to have entered shutdown.
CL= 15pF, S1 closed, Figures 8 and 10
CL= 100pF, S2 closed, Figures 8 and 10
R
DIFF
= 54, CL1= CL2= 100pF,
Figures 7 and 9
CL= 100pF, S1 closed, Figures 8 and 10
R
DIFF
= 54, CL1= CL2= 100pF,
Figures 7 and 9
ns200t
DLZ
CL= 100pF, S2 closed, Figures 6 and 12
Driver Disable Time from Low
CL= 100pF, S1 closed, Figures 6 and 12
R
DIFF
= 54, CL1= CL2= 100pF,
Figures 7 and 9
ns3000t
DZH
Driver Enable to Output High
ns3000
CONDITIONS
t
DZL
Driver Enable to Output Low
kbps250f
MAX
Maximum Data Rate
CL= 15pF, S2 closed, Figures 8 and 10
CL= 100pF, S2 closed, Figures 6 and 12
CL= 100pF, S1 closed, Figures 6 and 12
ns10 200t
DSKEW
Driver Output Skew
| t
DPLH
- t
DPHL
|
Figures 11 and 13
ns
ns20 50t
RZH
Receiver Enable to Output High
ns20 50t
RZL
Receiver Enable to Output Low
ns200t
DHZ
Driver Disable Time from High
ns
ns20 50t
RHZ
Receiver Disable Time from High
90 150
t
RPLH
,
t
RPHL
Receiver Input to Output
250 1000tDR, t
DF
Driver Rise or Fall Time
ns20 50t
RLZ
Receiver Disable Time from Low
Figures 11 and 13 ns15t
RSKD
| t
RPLH
- t
RPHL
| Differential
Receiver Skew
600 1000t
DPLH
ns
600 1000t
DPHL
Driver Input to Output
UNITSMIN TYP MAXSYMBOLPARAMETER
MAX1481 only (Note 4) ns50 200 600t
SHDN
Time to Shutdown
MAX1481 only, CL= 15pF, S2 closed, Figures 8 and 10
ns3000t
DZH(SHDN)
Driver Enable from Shutdown to Output High
MAX1481 only, CL= 15pF, S1 closed, Figures 8 and 10
ns3000t
DZL(SHDN)
Driver Enable from Shutdown to Output Low
MAX1481 only, CL= 100pF, S1 closed, Figures 6 and 12
ns1000t
RZL(SHDN)
Receiver Enable from Shutdown to Output Low
MAX1481 only, CL= 100pF, S2 closed, Figures 6 and 12
ns500t
RZH(SHDN)
Receiver Enable from Shutdown to Output High
MAX1481/MAX1484/MAX1485/MAX1486
Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
12Mbps, RS-485/RS-422 Transceivers in µMAX Package
_______________________________________________________________________________________
5
220
260
240
300
280
340
320
360
-60 -20 0-40 20 40 60 80 100
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
MAX1481/4/5/6-01
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
MAX1481/MAX1485
MAX1484/MAX1486
0
10
30
20
50
40
60
0
1
2 3 4 5
OUTPUT CURRENT vs.
RECEIVER OUTPUT LOW VOLTAGE
MAX1481/4/5/6-02
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
0
5
15
10
25
20
30
0
1
2 3 4 5
OUTPUT CURRENT vs.
RECEIVER OUTPUT HIGH VOLTAGE
MAX1481/4/5/6-03
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
94
98
106
102
110
114
-60 -20 0-40 20 40 60 80 100
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX1481/4/5/6-04
TEMPERATURE (°C)
SHUTDOWN CURRENT (nA)
75
80
90
85
100
95
105
-60 -20 0-40 20 40 60 80 100
MAX1481/MAX1485 RECEIVER
PROPAGATION DELAY vs. TEMPERATURE
MAX1481/4/5/6-07
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
C
LOAD
= 15pF
0.10
0.20
0.15
0.35
0.30
0.25
0.45
0.40
0.50
-60 -20 0-40 20 40 60 80 100
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
MAX1481/4/5/6-05
TEMPERATURE (°C)
OUTPUT LOW VOLTAGE (V)
IRO = 8mA
3.8
4.0
3.9
4.2
4.1
4.4
4.3
4.5
-60 -20 0-40 20 40 60 80 100
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
MAX1481/4/5/6-06
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
IRO = 8mA
86
87
90 89
88
93 92 91
94
-60 -20 0-40 20 40 60 80 100
MAX1484/MAX1486 RECEIVER
PROPAGATION DELAY vs. TEMPERATURE
MAX1481/4/5/6-08
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
C
LOAD
= 15pF
540
580
560
620
600
660
640
680
-60 -20 0-40 20 40 60 80 100
MAX1481/MAX1485 DRIVER
PROPAGATION DELAY vs. TEMPERATURE
MAX1481/4/5/6-09
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
R
DIFF
= 54
C
L1 = CL2 = 100pF
__________________________________________Typical Operating Characteristics
(VCC= +5V, TA= +25°C, unless otherwise noted.)
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